National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

75°F

24°C

Humidity 69%
Wind Speed Vrbl 6 mph
Barometer 29.99 in (1015.6 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 28 Jun 6:56 pm EDT
Extended Forecast for

Islip Terrace NY

Extreme Heat Watch July 1, 12:00pm until July 3, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch

  • Tonight

    Tonight: Patchy fog after 1am. Otherwise, partly cloudy, with a low around 63. Light and variable wind.

    Low: 63 °F

    Partly Cloudy
    then Patchy
    Fog

  • Monday

    Monday: Mostly sunny, with a high near 84. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 84 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 66. South wind 3 to 5 mph.

    Low: 66 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 84. Light southwest wind becoming south 9 to 14 mph in the morning.

    High: 84 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Southwest wind around 11 mph.

    Low: 69 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 63. Light and variable wind.
Monday
Mostly sunny, with a high near 84. Calm wind becoming south 5 to 7 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 66. South wind 3 to 5 mph.
Tuesday
Mostly sunny, with a high near 84. Light southwest wind becoming south 9 to 14 mph in the morning.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Southwest wind around 11 mph.
Wednesday
Mostly sunny, with a high near 90.
Wednesday Night
Partly cloudy, with a low around 73.
Thursday
Sunny, with a high near 91.
Thursday Night
Mostly clear, with a low around 77.
Friday
Sunny, with a high near 92.
Friday Night
Mostly clear, with a low around 75.
Independence Day
A 30 percent chance of showers. Mostly sunny, with a high near 89.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 72.
Sunday
Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
3:22 pm EDT Jun 28, 2026
Forecast Valid:
7pm EDT Jun 28, 2026-6pm EDT Jul 5, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation